$columns
is null
Use of `register_column_headers()` and `print_column_headers()` creates a `_WP_List_Table_Compat` without any columns. When the List Table object doesn't have any columns, there's naturally no primary column. Props danielbachhuber. Fixes #34148. git-svn-id: https://develop.svn.wordpress.org/trunk@35698 602fd350-edb4-49c9-b593-d223f7449a82
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